baffled

The mere sight of his excellent appetite was an assurance of success; for I had very clear recollections of days and nights without a thought of food, when his baffled mind had chafed before some problem while his thin, eager features became more attenuated with the asceticism of complete mental concentration.

His face turned upon us with a glare of baffled rage, which gradually softened into a rather shamefaced grin as he realized that two pistols were pointed at his head.

He tried to steal in, but was baffled by your wakefulness.

You do not imagine that if I were the pursuer I should allow myself to be baffled by so slight an obstacle.